If the tumor is in your cerebrospinal fluid (fluid in your brain and spine) and you have not received craniospinal radiation, you will receive etoposide "intrathecally" rather than by vein. This means the drug will be given directly into your cerebrospinal fluid. This will be done on Days 1 and 28 of every cycle. Your doctor will explain the intrathecal injection procedure to you in more detail, and you will sign a separate consent form for it.